Pump



H. M. CRIPPEN oct'. 7- 1924.,

PUMP

Filed Aug. 18, 1923 Inv@ infor:

Patented ct. 7, 1924.

.HENRY IVI. ORIPEEN, QF ATHENS, 10H10,

nssrenon or cnn-,FOURTH .To FRED H. FINSTERWALD AND o. A. rrnsuniawnro,:Born or AKRON, omo.l

PUMP'.

Application led August 18, 1923. Serial No. v 658,081412.

To @ZZ whom @it may cof/tecra.'

-Be 'it known that I, HENRY M. CRIPPEN, a citizen of the United `States,residing at Athens, in the county of Athensand State ci Ohio, haveinvented certain new and useful `:Improvements in Pumps, of which thefollowing is a specification.y

My invention relates to pumps.

The object ofthe invention is to avoid :the

vuse of cup leathers, 'in the use of which there is so much pressure onthe cylinder wall as to quickly wear out such form of packing, and ltosubstitute -a construction of piston in which an ordinary flat packingl5 strip-or ring may be employed, and ,in which `pressure will beexerted against the packing to force it in proper contact with thecylinder vwall during the compression (stroke, and

the suction stroke of the piston, causing a release of such pressure andpermitting a lfree flow of fluid ypast the piston .to again till 'thecylinder.

'These objects I' accomplish bythe construction shown in theaccompanying draw/ in@ in which;

2 ig. l shows in lvertical section a pump having my 'improvementsapplied thereto; the piston vbeing at the end or the compression stroke.

F ig. 2 is a plan view of the handle Aand hose retainer.

Fig. 3 is an enlarged sectional view of the upper end of the cylinder,showing the position of the piston elements as they near the end of thesuction or up stroke.

Fig. 4 shows a similar view with the parts inthe Vposition they'v occupyat the comple tion of the up stroke and beginning of lthe compression orydown stroke.

lFigs. 5 and'are sectional views oi' a mod- 'ied Jform of piston; Fig 5showing the parts inthe compression ystroke and Fig. '6 with the partsin the up or suction stroke.

Fig. '7 shows the packing strip.

The pump illustrated 'is shown as an ordinary air ortire Vintlating pump.comprising a cylinder 1, foot base 2 having a hose nipple 3 providedwith a suitable inward-ly `closing ball check valve et, cap piece 5 andhose 50 6 provided'with a suitable nozzle 6.

y'These parts are of the usual or any ap* proved construction and maybeadapted tor air, water .or other iiuid.

'The piston proper 10 yhas an annular tapered shoulder 11 around its:lower outer more air passages or openings *22" lextending verticallythrough it from its lower to its upper tace, other air and lubricatingports 25 extending from the upperend of the piston body 13 downwardlyand fout-- wardly to the rear face vof the packing 16. A valve r14C 'inthe form of an inverted cup 'is provided at `its lower edge with labevel -15 y which, `in connection with the beveled shoulder y11, willtend in the down or coinpression stroke lto torce packinglstrip '1'6 outagainst the cylinder wall .fand prevent the air from escaping past theedges-of the strip. The 'upper end ofthe Ipiston body 13 yisv ofslightly less diameter than the interior of the valve Msothat the pistonbody 13 will telescope therein and be held properly and guided at thispoint'. The valve 14 has a central ldownwardly tapering yopening 17 eX-tending through its `upper closed end and this tapered opening isadapted to yreceive a tapered shoulder 22 on the rod 20 at the upper endoi' its reduced portion.v The 'shoulder r22 wedges lint-o this taperedopening 17 on the `down stroke of the piston, and rin sov doing closesthe said opening and forces down the valve 14 until its beveled edgefirmly engages vthe upper redge of the packing so that nojliuid may passthe piston dur` ing the effective stroke.- -Then the .piston `is movedupward on its suction"strokejthe vrod 20 will lift the valve 11i, Ias inFig. 3, and Iperm-'it air vin 'the cylinder to `rushpast the exterior ofthe said valve under its lower edge-and down through opening 22 'intothe lower end of lthecyl-inder; the packing 16at this time being :freefrom the compressing action of the vbeveled portions 15, 11, vand sowill be relieved of wear. When the vpiston reaches 'its extreme up.stroke the valve may yStrike `cap 5 and be momentarily released, as inFig; @whereupon the downward movement oit .rod 720 will torce `theshoulder into Ithe valve opening 17, which in turn will cause the partsto assume the position shown in Figs. 1 and 3. In such down or pressurestroke air will pass up through opening 22 into the air chamber formedby the interior of valve 14 and through openings 25 and exert outwardpressure on the rear face of the packing strip and assist in holding itto the cylinder wall. When the valve 14 is thus released by striking cap5 the nut 21 will lift piston 10 until packing 16 is forced againstbevel 15 and so expand the packing and tighten it against cylinder wall.rllhis is useful in case of the packing becoming contracted or setshould the pump remain idle for any length of time.

'Ihe conical surfaces 22, 17 will hold the valve 14 strictly parallelwith the interior of the cylinder and hold it against any tiltingaction.

It will be understood, of course, that the valve 144 is of less externaldiameter than the interior of the cylinder so that the air is free topass in the up or suction stroke and also that the cylinder is open tothe atmosphere through the opening in cap 5 or otherwise.

In Figs. 5 and 6 the valve 14 is provided with grooves 2S to allow thefree passage of the fluid to and under the lower edge of the valve andthence down through the opening vor openings 22', as in Figs. 1 and 2,when the valve is raised on the up stroke, as in Fig. 6. The operationis the same as in Figs. 1, 3 and 4.

The lower inner face of valve 14 has a rounded boss 27 and the upperface of the piston body 13 has a corresponding recess 27 to receive thisboss and permit the parts to telescope as the packing wears down.

It will be noticed that the inner lower face of valve 14 is of lessdiameter than the lower face of the piston 10 so that there is lesspressure on valve 14 during the compression stroke than there is uponthe lower end of piston 10, which allows the piston to move up to thelower edge of the packing to close all. leak at this point.

I have found that Babbitt metal is a good material for the piston andits valve, and as the piston rod is of steel there will be the properamount of friction between the conical surfaces 22, 17 to cause the rodto lift the valve as described.

The upper end of the rod 2O is formed as a combined handle and hoseretainer 29. The handle has an opening at both sides of the rod and thefree end of the hose 6, is passed up through one opening and downthrough the other, as in Fig. 1, so that the hose is properly securedwhile the pump is being carried or is in storage. The handle is formedby bending the rod in the form of two loops 30, 30 lying in a horizontalplane with the free end 31 of the loop swaged down, where it joins theupper end of rod 20. A clip 32 embraces the. parts at this point. Thisforms a highly useful improvement, as heretofore the hose has been freeto fall around in the way, and this trequently causes the hose and valve6 to become injured.

What I claim is:

1. In a pump, a piston comprising a cylindrical body having an airopening eX- tending therethrough from its upper to its lower side, acentral opening, and an external annular collar or shoulder around itslower end, a piston rod extending at its lower end freely through thesaid central opening' and having means for holding` the valve fromfalling off, a valve on the rod above the piston in the form of aninverted rigid cup with its lower packing-expanding edge spaced. fromthe said annular shoulder;

the space between said lower edge of the valve and the said shoulderprovided with a packing strip.

2. The combination with a piston rod and a piston having a cylindricalbody through which the lower end of the rod freely :l

passes for limited movement; said body having an opening through it toone side of the rod and an external annular shoulder around its lowerend, a packing strip around said cylindrical portion, and an invertedcup-shaped valve carried by the rod with its lower edge engaging theupper edge of the packing strip; the valve being constructed for thepassage of liuid around and under its lower edge to the piston passage.

3. The combination with a piston rod provided with a reduced lower endhaving a downward tapered shoulder at the juncture of its two diameters,of a piston mounted freely on the lower end', of the rod for limitedvertical movement thereon, the said piston having a cylindrical body toreceive a packing strip therearound, an external annular shoulder tosupport the lower edge of said packing and a through fluid passage toone side of the piston rod, and an inverted cup-shaped valve having atapered opening in its upper closed end to receive the tapered shoulderon the piston rod; the lower edge of the valve adapted to engage *theupper edge of the packing in the compression stroke and the valve andpistony moving apart on the suction stroke to allow the iiuid to passthe lower edge of the valve and pass through the piston passage.

4. The combination with a piston rod, of a piston through which thelower end of the rod freely passes, a nut on the rod below the piston;said piston having a cylindrical body, an external annular taperedshoulder and a through fluid passage, and other passages leading fromits upper edge out through its side wall, a packing strip around thecylindrical body with its lower edge resting on said shoulder, and avalve on llt) the rod over the piston and rhaving an annular bevelededge engaging the upper edge of the packing strip.

5. The combination with a piston rod having a tapered shoulder, of apiston having limited movement on the rod below said shoulder andprovided with a through port or passage, and an external annular collar,an inverted cup-like valve telescoping the body of the piston andhavinga central tapered opening receiving said tapered shoulder; the innerlower face of the valve having a central boss and the upper end of thepiston body having a recess to receive said boss.

In testimony whereof I zLfIiX my signature.

HENRY CRIPPEN.

